I keep reading about the FactoryPro Shift kit that people install and would like to know if it really is that big of a difference. My F4 has about 12K miles total on it and most everything (internals) is brand new so it's not like I'm replacing "warn out/damaged" parts. $200 is a lot of money to spend for something if it doesn't do any good (or noticeable good). However, if it really makes a difference, then I'm all for it.

Input?

Chris